Abstract
We investigate the effects in the spectral properties of a massive Dirac system of the dynamical renormalization induced by disorder/impurity scattering within the self-consistent Born approximation. We show how these effects lead to a remarkable closing of the bandgap edge. Above a critical value Uc of the impurity scattering the gap eventually closes, giving rise to a finite density of states at zero energy. We show that the bandgap closing stems from the quasiparticle dynamical renormalization, and it is not associated with the vanishing of the effective massive term. Incoherent processes are fundamental to describe such physics.
| Original language | English |
|---|---|
| Article number | 054205 |
| Journal | Physical Review B |
| Volume | 96 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 15 Aug 2017 |
Funding
We thank M. A. H. Vozmediano for enlightening discussions about aspects of renormalization group and A. V. Balatsky for useful discussion. H.R. was supported by Fondazione Istituto Italiano di Tecnologia, the European Union's Horizon 2020 research. E.C. acknowledges financial support from the European Project FP7-PEOPLE-2013-CIG LSIE 2D and from Italian MIUR-PRIN Project 2015WTW7J3.
| Funders | Funder number |
|---|---|
| MIUR-PRIN | 2015WTW7J3 |
| Horizon 2020 | FP7-PEOPLE-2013-CIG LSIE 2D |
| Italian Institute of Technology |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics